Download youtube videos listed in a file to flac format and rename

ytdl.py

import os
import re
import string

fileName = ''
vidReg = re.compile(r'youtube\.com')
fileRead = open('./req.txt')
length = len(open('./req.txt').readlines(  ))
video = fileRead.readlines()
for x in range(length):
    cut = video[x]
    cut = cut[:-1]
    video[x] = cut
for x in range(length):
    vidMatch = vidReg.search(video[x])
    if vidMatch != None:
        if len(fileName) > 0:
            os.system('youtube-dl -x --audio-format flac ' + ' -o \"' + fileName + '.%(ext)s\" ' + video[x] )
        else:
            os.system('youtube-dl -x --audio-format flac ' + video[x])
    else:
        fileName = video[x]
       
#--req.txt--
#Namana Natavara
#https://www.youtube.com/watch?v=enC-zfmvbcs
#Lagi Kalejwa Katar
#https://www.youtube.com/watch?v=Ww6aQe7qqWQ